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Ukraine-Russia crisis: What to know about the fears of war

A Ukrainian serviceman handles large caliber ammunitions for armored fighting vehicles mounted weapons during an exercise in a Joint Forces Operation controlled area in the Donetsk region, eastern Ukraine, Thursday, Feb. 10, 2022. A peace agreement for the separatist conflict in eastern Ukraine that has never quite ended is back in the spotlight amid a Russian military buildup near the country's borders and rising tensions about whether Moscow will invade.(AP Photo/Vadim Ghirda)

Ukraine-Russia crisis: What to know about the fears of war